1580s, "that which is added," also "act of acceding" (by assent, to an agreement, etc.), from Latin accessionem (nominative accessio) "a going to, approach; a joining; increase, enlargement," noun of action from past-participle stem of accedere "approach, enter upon" (see accede). From 1640s as "act of coming to a position or into possession," especially in reference to a throne. Related: Accessional.
c. 1400, "affording access, capable of being approached or reached," from Old French accessible and directly from Late Latin accessibilis, verbal adjective from Latin accessus "a coming near, an approach; an entrance," from accedere "approach, go to, come near, enter upon" (see accede). The meaning "easy to reach" is from 1640s; of art or writing, "able to be readily understood," by 1961 (a word not needed before writing or art often deliberately was made not so). Related: Accessibility.
early 14c., "an attack of fever," from Old French acces "onslaught, attack; onset (of an illness)," from Latin accessus "a coming to, an approach; way of approach, entrance," noun use of past participle of accedere "to approach," from assimilated form of ad "to" (see ad-) + cedere "go, move, withdraw" (from PIE root *ked- "to go, yield"). The English sense of "an entrance" (c. 1600) is directly from Latin. The meaning "habit or power of getting into the presence of (someone or something)" is from late 14c.
late 14c., "to take what is offered; admit and agree to (a proposal, etc.)," from Old French accepter (14c.) or directly from Latin acceptare "take or receive willingly," frequentative of accipere "receive, get without effort," from ad "to" (see ad-) + capere "to take" (from PIE root *kap- "to grasp"). Related: Accepted; accepting.
1690s, from Medieval Latin accentuationem (nominative accentuatio) "intoning, chanting," noun of action from past-participle stem of accentuare "to accent," from Latin accentus "song added to speech," from ad "to" (see ad-) + cantus "a singing," past participle of canere "to sing" (from PIE root *kan- "to sing").